> I tried: <<tiddler ThumbThing with:http://www.unamesa.org/images/header.png
> 100px>> - no luck

When entering macro parameters that start with "http:" you need to
enclose it within [[...]].  Otherwise, TW will interpret the leading
http: as a parameter 'name', resulting in a param named "http" with a
value of "//www.unamesa.org/images/header.png".  Thus:

<<tiddler ThumbThing with:
   [[http://www.unamesa.org/images/header.png]] 100px>>

and, to use an image URL stored in a field, you will need to use the
<<wikify>> macro [1] to insert the value into the appropriate place,
like this:

<<wikify {{'\<\<tiddler ThumbThing with: [[%0]] 100px\>\>'}}
im...@here>>

enjoy,
-e

[1] http://www.TiddlyTools.com/#WikifyPlugin
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